Libav
sierravmd.c
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1 /*
2  * Sierra VMD Format Demuxer
3  * Copyright (c) 2004 The ffmpeg Project
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
31 #include "libavutil/intreadwrite.h"
32 #include "avformat.h"
33 #include "internal.h"
34 
35 #define VMD_HEADER_SIZE 0x0330
36 #define BYTES_PER_FRAME_RECORD 16
37 
38 typedef struct {
40  int64_t frame_offset;
41  unsigned int frame_size;
42  int64_t pts;
43  int keyframe;
44  unsigned char frame_record[BYTES_PER_FRAME_RECORD];
45 } vmd_frame;
46 
47 typedef struct VmdDemuxContext {
50 
51  unsigned int frame_count;
52  unsigned int frames_per_block;
54  unsigned int current_frame;
55  int is_indeo3;
56 
59  int skiphdr;
60 
61  unsigned char vmd_header[VMD_HEADER_SIZE];
63 
64 static int vmd_probe(AVProbeData *p)
65 {
66  int w, h;
67  if (p->buf_size < 16)
68  return 0;
69  /* check if the first 2 bytes of the file contain the appropriate size
70  * of a VMD header chunk */
71  if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
72  return 0;
73  w = AV_RL16(&p->buf[12]);
74  h = AV_RL16(&p->buf[14]);
75  if (!w || w > 2048 || !h || h > 2048)
76  return 0;
77 
78  /* only return half certainty since this check is a bit sketchy */
80 }
81 
83 {
84  VmdDemuxContext *vmd = s->priv_data;
85  AVIOContext *pb = s->pb;
86  AVStream *st = NULL, *vst;
87  unsigned int toc_offset;
88  unsigned char *raw_frame_table;
89  int raw_frame_table_size;
90  int64_t current_offset;
91  int i, j, ret;
92  unsigned int total_frames;
93  int64_t current_audio_pts = 0;
94  unsigned char chunk[BYTES_PER_FRAME_RECORD];
95  int num, den;
96  int sound_buffers;
97 
98  /* fetch the main header, including the 2 header length bytes */
99  avio_seek(pb, 0, SEEK_SET);
101  return AVERROR(EIO);
102 
103  if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3')
104  vmd->is_indeo3 = 1;
105  else
106  vmd->is_indeo3 = 0;
107  /* start up the decoders */
108  vst = avformat_new_stream(s, NULL);
109  if (!vst)
110  return AVERROR(ENOMEM);
111  avpriv_set_pts_info(vst, 33, 1, 10);
112  vmd->video_stream_index = vst->index;
113  vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
114  vst->codec->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
115  vst->codec->codec_tag = 0; /* no fourcc */
116  vst->codec->width = AV_RL16(&vmd->vmd_header[12]);
117  vst->codec->height = AV_RL16(&vmd->vmd_header[14]);
118  if(vmd->is_indeo3 && vst->codec->width > 320){
119  vst->codec->width >>= 1;
120  vst->codec->height >>= 1;
121  }
122  vst->codec->extradata_size = VMD_HEADER_SIZE;
123  vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
124  memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
125 
126  /* if sample rate is 0, assume no audio */
127  vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
128  if (vmd->sample_rate) {
129  st = avformat_new_stream(s, NULL);
130  if (!st)
131  return AVERROR(ENOMEM);
132  vmd->audio_stream_index = st->index;
135  st->codec->codec_tag = 0; /* no fourcc */
136  if (vmd->vmd_header[811] & 0x80) {
137  st->codec->channels = 2;
139  } else {
140  st->codec->channels = 1;
142  }
143  st->codec->sample_rate = vmd->sample_rate;
144  st->codec->block_align = AV_RL16(&vmd->vmd_header[806]);
145  if (st->codec->block_align & 0x8000) {
146  st->codec->bits_per_coded_sample = 16;
147  st->codec->block_align = -(st->codec->block_align - 0x10000);
148  } else {
149  st->codec->bits_per_coded_sample = 8;
150  }
151  st->codec->bit_rate = st->codec->sample_rate *
153 
154  /* calculate pts */
155  num = st->codec->block_align;
156  den = st->codec->sample_rate * st->codec->channels;
157  av_reduce(&den, &num, den, num, (1UL<<31)-1);
158  avpriv_set_pts_info(vst, 33, num, den);
159  avpriv_set_pts_info(st, 33, num, den);
160  }
161 
162  toc_offset = AV_RL32(&vmd->vmd_header[812]);
163  vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
164  vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
165  avio_seek(pb, toc_offset, SEEK_SET);
166 
167  raw_frame_table = NULL;
168  vmd->frame_table = NULL;
169  sound_buffers = AV_RL16(&vmd->vmd_header[808]);
170  raw_frame_table_size = vmd->frame_count * 6;
171  if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
172  av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
173  return -1;
174  }
175  raw_frame_table = av_malloc(raw_frame_table_size);
176  vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame));
177  if (!raw_frame_table || !vmd->frame_table) {
178  ret = AVERROR(ENOMEM);
179  goto error;
180  }
181  if (avio_read(pb, raw_frame_table, raw_frame_table_size) !=
182  raw_frame_table_size) {
183  ret = AVERROR(EIO);
184  goto error;
185  }
186 
187  total_frames = 0;
188  for (i = 0; i < vmd->frame_count; i++) {
189 
190  current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
191 
192  /* handle each entry in index block */
193  for (j = 0; j < vmd->frames_per_block; j++) {
194  int type;
195  uint32_t size;
196 
197  avio_read(pb, chunk, BYTES_PER_FRAME_RECORD);
198  type = chunk[0];
199  size = AV_RL32(&chunk[2]);
200  if (size > INT_MAX / 2) {
201  av_log(s, AV_LOG_ERROR, "Invalid frame size\n");
202  ret = AVERROR_INVALIDDATA;
203  goto error;
204  }
205  if(!size && type != 1)
206  continue;
207  switch(type) {
208  case 1: /* Audio Chunk */
209  if (!st) break;
210  /* first audio chunk contains several audio buffers */
211  vmd->frame_table[total_frames].frame_offset = current_offset;
212  vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
213  vmd->frame_table[total_frames].frame_size = size;
214  memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
215  vmd->frame_table[total_frames].pts = current_audio_pts;
216  total_frames++;
217  if(!current_audio_pts)
218  current_audio_pts += sound_buffers - 1;
219  else
220  current_audio_pts++;
221  break;
222  case 2: /* Video Chunk */
223  vmd->frame_table[total_frames].frame_offset = current_offset;
224  vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
225  vmd->frame_table[total_frames].frame_size = size;
226  memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
227  vmd->frame_table[total_frames].pts = i;
228  total_frames++;
229  break;
230  }
231  current_offset += size;
232  }
233  }
234 
235  av_free(raw_frame_table);
236 
237  vmd->current_frame = 0;
238  vmd->frame_count = total_frames;
239 
240  return 0;
241 
242 error:
243  av_free(raw_frame_table);
244  av_free(vmd->frame_table);
245  return ret;
246 }
247 
249  AVPacket *pkt)
250 {
251  VmdDemuxContext *vmd = s->priv_data;
252  AVIOContext *pb = s->pb;
253  int ret = 0;
254  vmd_frame *frame;
255 
256  if (vmd->current_frame >= vmd->frame_count)
257  return AVERROR(EIO);
258 
259  frame = &vmd->frame_table[vmd->current_frame];
260  /* position the stream (will probably be there already) */
261  avio_seek(pb, frame->frame_offset, SEEK_SET);
262 
264  return AVERROR(ENOMEM);
265  pkt->pos= avio_tell(pb);
266  memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
267  if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
268  ret = avio_read(pb, pkt->data, frame->frame_size);
269  else
270  ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD,
271  frame->frame_size);
272 
273  if (ret != frame->frame_size) {
274  av_free_packet(pkt);
275  ret = AVERROR(EIO);
276  }
277  pkt->stream_index = frame->stream_index;
278  pkt->pts = frame->pts;
279  av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
280  (frame->frame_record[0] == 0x02) ? "video" : "audio",
282  pkt->pts);
283 
284  vmd->current_frame++;
285 
286  return ret;
287 }
288 
290 {
291  VmdDemuxContext *vmd = s->priv_data;
292 
293  av_free(vmd->frame_table);
294 
295  return 0;
296 }
297 
299  .name = "vmd",
300  .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD"),
301  .priv_data_size = sizeof(VmdDemuxContext),
306 };
unsigned int frame_count
Definition: sierravmd.c:51
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
Bytestream IO Context.
Definition: avio.h:68
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
int size
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:243
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:998
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:2821
int index
stream index in AVFormatContext
Definition: avformat.h:700
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:186
#define AV_RL16
Definition: intreadwrite.h:42
int64_t audio_sample_counter
Definition: sierravmd.c:58
#define AV_CH_LAYOUT_STEREO
unsigned int frames_per_block
Definition: sierravmd.c:52
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:1828
unsigned int current_frame
Definition: sierravmd.c:54
Format I/O context.
Definition: avformat.h:922
static int vmd_read_close(AVFormatContext *s)
Definition: sierravmd.c:289
int audio_stream_index
Definition: sierravmd.c:49
int keyframe
Definition: sierravmd.c:43
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2518
int stream_index
Definition: sierravmd.c:39
uint8_t * data
Definition: avcodec.h:973
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:219
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2507
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:452
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:81
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:186
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:144
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:168
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1852
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:718
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)
Reduce a fraction.
Definition: rational.c:35
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:398
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:397
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:531
int bit_rate
the average bitrate
Definition: avcodec.h:1114
audio channel layout utility functions
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
AVInputFormat ff_vmd_demuxer
Definition: sierravmd.c:298
#define BYTES_PER_FRAME_RECORD
Definition: sierravmd.c:36
#define AV_RL32
Definition: intreadwrite.h:146
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:544
Stream structure.
Definition: avformat.h:699
static int vmd_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: sierravmd.c:248
int video_stream_index
Definition: sierravmd.c:48
NULL
Definition: eval.c:55
enum AVMediaType codec_type
Definition: avcodec.h:1058
enum AVCodecID codec_id
Definition: avcodec.h:1067
int sample_rate
samples per second
Definition: avcodec.h:1791
AVIOContext * pb
I/O context.
Definition: avformat.h:964
vmd_frame * frame_table
Definition: sierravmd.c:53
static int vmd_read_header(AVFormatContext *s)
Definition: sierravmd.c:82
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1082
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:402
int64_t pts
Definition: sierravmd.c:42
This structure contains the data a format has to probe a file.
Definition: avformat.h:395
unsigned char vmd_header[VMD_HEADER_SIZE]
Definition: sierravmd.c:61
int64_t frame_offset
Definition: sierravmd.c:40
Main libavformat public API header.
unsigned char frame_record[BYTES_PER_FRAME_RECORD]
Definition: sierravmd.c:44
int channels
number of audio channels
Definition: avcodec.h:1792
void * priv_data
Format private data.
Definition: avformat.h:950
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:525
unsigned int frame_size
Definition: sierravmd.c:41
#define VMD_HEADER_SIZE
Definition: sierravmd.c:35
static int vmd_probe(AVProbeData *p)
Definition: sierravmd.c:64
int stream_index
Definition: avcodec.h:975
#define AV_CH_LAYOUT_MONO
This structure stores compressed data.
Definition: avcodec.h:950
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:205
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:966